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The configured mbuffer path will be called on both the source and target system. If you use pkgs.mbuffer from the source host and the target host does not have this exact derivation, you will get a broken pipe when sending snapshots. This is the case when transferring to a non-NixOS system or to a host with a different mbuffer version.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.